Flashers blinkers brake lights not working - 1998 GMC Safari

If your brake lights are working, then the wiring to the turn signals are good. Check the turn signal flasher which is under the dash. Try your emergency flashers. Do they work?

Just no turn signals in the back now? Maybe didn't install the bulbs tight back into the asm? No brake lights...do the lights work with headlights on and just no illumination with the brake pedal depressed? Could be brake light switch.

you need a new turn signal flasher

The hazard flasher is a separate flasher by itself for the directional has its own. The brake lights work off the brake light switch mounted by the brake pedal

The Blinkers and the Brake Lights are the same bulb. So check the brake light switch. Flashers use a different flasher unit, than the turn signals

No Turn Signal Operation (blinker)The turn signal lights in your car are a basic electrical system that controls the front and rear blinker lights to alert the intended direction of the vehicle. We have listed some of the most common problems and repair troubleshooting tips below:
Troubleshooting Procedure
To start troubleshooting this problem:

• Turn the key to the on position (do not start engine)
  
• Inspect the system fuse located in the fuse panel and replace if needed. If you cannot find the location of the blinker fuse consult your owner's manual or an online repair manual
  
• When a blinker flasher fails it can cause blinker lights to say on, not blink, or not go on at all. To test the blinker system flasher, remove the flasher unit and insert a jumper wire between the two terminals. If blinker stays on in both directions without blinking, replace the flasher. If you cannot find the location of the blinker flasher consult your owners manual or an online repair manual.
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flasher located at bottom of fuse box its round bout the size of a pop bottle lid,hazard flasher located at top

there are two turn signal flashers under dash one on fuse box and one next to the light switch have to look up behind dash behind light switch for second I had same problem

check and test the socket ( pig tail ) that the lite plus int for power when the flasher is on. If there is power to it try a different bulb, if there is no power then you will need to trace the wiring circuit back towards the fuse box testing for power at all junctions. Good luck, and remember to rate all solutions you get. Thanx

Check to see if you have a burnt out light bulb, that usually causes your blinkers to stop working when you apply the brakes. and check your four way flasher fuse, it's part of your turn signals and brake lighting system.